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Old 07-25-2019, 07:11 AM
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don't know sh!t about IFS

Join Date: Oct 2009
Location: Phoenix Az
Posts: 16,084


Originally Posted by Bdsankey View Post
After looking at the rpm/speed calculator I can see why. 3rd gear is only 2.1:1 ratio whereas 4th is 1.31:1. Every auto duramax guy until up until 800-1000hp runs 3rd gear in an Allison which is 1.41:1 so he should be able to run it in 4th.
but you are not accounting for converter torque coupling that basically reduces 4th gear ratio by 2 or 3:1 UNTIL you hit lock up. that helps get you out of the gate with enough speed before hitting lock up and carrying it through.

you slip a clutch like this and it wont last long
Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.

02 LB7, LLY, LBZ, LMM, LML, L5P 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
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